Operation Sports have posted a Q&A with Lead Designer Mike Olsen about Tiger Woods PGA Tour 2004:
Operation Sports: Will their be more pro's and less fictional players because of the new career mode?
Mike Olsen: Our Career Mode was formerly called "Tiger Challenge", but that has been replaced with several new game modes, including the PGA TOUR Season, World Tour, and Real Time Events, to name a few. Of those modes, only the World Tour mode requires you to play against A.I. opponents, and there are 15 PGA TOUR golfers and 12 fictional players in that mode to test your mettle.